I have the same problem on a PC with Windows 7 Enterprise 32 bits.
After aplying the suggested solution by Rafeeq it looks well, three green checks, but PTP still outdated.
After waiting some minutes the same problem arise:
Proactive Threat Protection is OFF, Definitions: "Waiting for updates" and Log says again the same:
"TruScan has generated an error: code 11: description: Whitelist Failure"
The Windows 7 is a fresh instalation.
Are there a solution for this?